Renzo Gracie, one of Brazilian jiu-jitsu's great ambassadors, has taken many trips to Abu Dhabi over the past two decades. In April, he'll journey back to the oil-rich Gulf state, where, for the past 14 years, he has served as the personal instructor to Sheikh Tahnoon Bin Zayed Al Nahyan -- son to the first United Arab Emirates president, creator of the Abu Dhabi Combat Club Submission Wrestling World Championship and newly minted 10-percent owner of Zuffa LLC.